Răspuns:
1. ma=53,43
2. a=12,54 b=17,8 c=35,6
3. x= 12,5
Explicație pas cu pas:
1. ma= (a+b)/2
ma=(17,56+89,3)/2
ma=106,86/2
ma=53,43
2. ma=21,98
b=a+5,26
c=2b
_________
(a+b+c)/3=21,98
(b-5,26+b+2b)/3=21,98
4b-5,26=65,94
4b=71,2
b=17,8 => c=35,6 => a=12,54
3. Notam x -numarul
[(x+63,42)*1,2-45,304]/3,664=x
(1,2x + 76,104 - 45,304) / 3,664 = x
1,2x + 30,8 = 3,664x
2,464x = 30,8
x = 12,5
